reynolds



5 Sheets-Sheet 1;

1 1..A REYNOLDS au J. ENGLISH.

METAL SGRBW MACHINE.

Patented ont. 31, 1882;

Ny PETERS1 Pme-mhugnpher. wuhinwh. n.6.

(Model.) heats-#sheen 2. H. REYNOLDS ENGLISH. METAL SGRBWIM'AGHINB. 180.286.891. Patented 001;. 81, 1882.

(Model.) 5 Sheets-Sheet 3.

H. REYNOLDS 8u J. ENGLISH. l

METAL soms-w MACHINE. 4 No: 266,891. y Patented 00h31, 1882.,

N. PETERS. Phokw-Liliwgrzphnr` wndxingron. D. C.

(Model.) 5 sheets-sheet 4..

H'. REYNOLDS 8v J". ENGLISH.

METAL SG'EEW MACHINE. No. 266,891. Patented Oct.v 31, 1882..

Finns, mwumpvm. www n, c;

(Model.) 5 Sheets-Sheet 5,Y

H. REYNOLDS & J. ENGLISH.

METAL SCREW EMGEIEE.V A 180.286,891, Patnted oct. 81, 1882/.,

UNITED STATES PATENT Ormea,

HENRY REYNOLDS AND JAMES ENGLISH, OF NEW HAVEN, CONNECTICUT, ASSIGNORS TO REYNOLDS & CO., OF SAME PLACE.

METAL-SCREW MACHINE.

SPECIFICATION forming part of Letters Patent No. 266,891, dated October 31, 1882.

Application Iiled June 23, lSSl. (Model.)

.To all whom it may concern: Y

Beit known that we, HENRY REYNOLDS and J AMES ENGLISH, of New Haven, in the county of New Haven and State ofOonnecticut,have

invented a new Improvement in Metal-Screw Mac-hines; and we do hereby declare the following', when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and

1o exact description of the saine, and which said drawings constitute part of this specification, and represent, inl Figure 1, a top or plan view; Fig. 2, front side view; Fig. 3, transverse section on Vline f5 x x,- Figs. 4 to 17, inclusive, detached views.

lThis invention relates to an improvement in that class of machines for making screws which are constructed to receive the rod from which the screws are to be made through a hollow 2o mandrel. The screw-blank is formed by cutting down the rod. Then the thread is cut upon the body; and, finally, the screw isseparated from the rod, the rod being then advanced fora second screw, and soon, the screws thus produced being whatare commonly known as milled work.

The object of this invention is the construction of a machine which shall perform its work with greater facility and uniformity than has 3o heretofore been donc; and it consists in the construction, arrangement, and combination of mechanism, as hereinafter described, and particularly recited in the claims.

A represents the frame of the machine, which supports the operative'mechanism; B, the driving-shaft, supported in bearings B', and to which power is applied through a fixed pulley, B2, thereon, or otherwise.

O is the mandrel, supported in bearings C',

4o and fitted at its inner end with a chuck, consisting of head O2, in which gripping-jaws O3 are hung to grasp the blank-rod in the usual manner for this class ot' machines. On the mandrel O is a movable clutch, G4, splined to the mandrel, so as to revolve with it and yet be free for longitudinal movement. On the same mandrel is a loose collar, D, forward of the clutch, which is attached to or made apart of a pinion, D.. In rear of the clutch CA1 is aY 5o second loose collar, E, which is attached to or l made a part of a pinion, E.

The faces ofthe two collars l) E are constructed to engage with the adjacent faces of the clutch Cv1 when that clutch is moved so as to bring those faces into contact-that is to say, if moved forward it engages the collar D, and it' moved to the rear it engages the collar E. At a position intermediate between the two collars no engagement will be made with either. A constant revolution is imparted to the collar D from a 6J gear, D2, 011 the driving-shaft, in connection with the pinion D', by intermediate gears, D3 and D4, the revolution of the collar D being in the forward direction-thatv is to say, in the direction for work upon the rod or blank. The other collar, E, is caused to revolve in the op.w posite direction by a gear, E2, on the drivingshaft, working into the pinion E on the collar E, so that when engaged with the collar D the driving-shaft imparts a constant forward 7o or working revolution to the said collar D, and when engaged with the collar E it imparts a constant reverse revolution to the collar E. Hence a corresponding revolution is imparted to the hollow mandrel O and to the rod held 75 therein.

The jaws O3 are hung in the mandrel upon pivots o, as seen in Fig. 5, their tailends turning outward from the mandrel, the onein one direction and the other in the opposite diree- 8o tion, as seen at o' a.

On the mandrel, near the tails of the jaws, is a sleeve, O5, arranged to be moved longitudinally out from or in between the tails of the jaws. The forward end of this sleeve is inclined or made cam shape, so that as it is moved forward between the tails of the jaws it forces them apart and closes the jaws upon the rod; but when moved in the opposite direction, as indicated in broken lines, Fig. 5, it 9c releases the tails of thejaws and loosens their grasp upon the rod. The movement to open the jaws is produced by an inclined rib, CG, (see Fig. 11,) on the surface ofthe cam O7 on the camshaft B3. This rib strikes the lower end of a lever, C, which is hung to a fulcrum, C9, above, (see Fig. 5,) and is attached to the sleeve G5, so that as the cam-rib O6 strikes upon the front side of the lower end of the lever O8 it will force it rearward, as indicated in broken rco lines, Fig. 5, and draw the sleeve G5 out from between the tails of the jaws, so as to cause the jaws to release their grip upon the rod. Instantly upon the release ot' the grip ot' the jaws upon the rod it (the rod) is moved forward by any suitable force applied at the rearsuch as a spring, a weight, or it may be by handuntil the required length to make ascrew projects from between thejaws. Then areverse rib, C10, on the sameeam, C1, strikes the lower end of the lever C11 upon the opposite side, forcing it forward, and with it the sleeve G5, between the tails of the jaws to force them apart and press the ends of thejaws upon the rod, so as to grip and hold the rod and cause it to turn with the revolving mandrel.

To make a self-adjusting pressure upon the jaws, so that they may he adapted to grasp rods of slightly-varying size, or to operate varying diameters of the same rod, the fulcrnm (.39 at the upper end of the rod C11l is made upon a spindle, G11, with a spring, G12, arranged to bear against the fulcrum end of the lever, and so that while the operation ot' the cam-ribs at the lower end is positive the upper end will give way under a too great force, so that as soon as the jaws have firmly grasped the rod the spring C12 will yield for the completion of the movement of the lever. Hence the grasp of the jaws upon the rib is limited or regulated by the force or power of the spring U12, and this power may be adjusted by means of anut, C11', on the spindle C11. The tails of thejaws are forced together by a U-shaped spring, C11, its two ends being connected respectively to the two tails a a' of the jaws, so as to force them together when the cam is withdrawn.

D5 is the tool carrier or slide, which is arranged to move transversely across the machine upon a transverse guide, D5. This transverse guide D6 is arranged upon or made a part ot a longitudinally-sliding carriage, D1, the said carriage being arranged to be moved longitudinally between guides D11. The longitudinal movementof the carriage Dlisimparted by a cam, D9, shown detached in Fig. 12, top View, and in Fig. 13, a partial end view, Fig. 10 being a diagram showing the entire surface of the cam on a reduced scale. On this cam D9 is a rib, D10, which works against a stud, d, extending down from the carriage D7, as seen in Fig. 2. The advance movement otl the slide begins with the end d ofthe rib D10. Broken lines indicate the stud d. (See Fig. 10.) The rib from that point running spirally over the surface of the cam advances the carriage D7 toward the head of the mandrel, and with it carries the transverse slide D5 to the extent of the inclination of the rib from the point d to the other end, d2, of that portion ot" the rib. At this point, as indicated in broken lines, Fig. 10, the next section of the rib at d3 strikes the stud d upon the opposite side. Theinclination of the rib from the point dto the point d4 is short and quick and opposite to that part of the rib from d' to d2, so as to give a very quick v '-1 ecasot return of the carriage D1, carrying the traiisi verse slide D5. This brings the slide back to its point ot1 starting, and from that point, d1, to the end yd5 of the rib the slide remains stationary, as hereinafter described. The transverse slide D5 carries the-several tools necessary for doing the work upon the rod to produce the screw, (here represented as a milling-tool, D11, and the screw-cutting die D12.)

In Fig. 1 the slide D5 is represented as in the position for presenting the milling-tool D11. The rod having been advanced so as to leave the requisite length,D13, projecting through the mandrel, as before described, the slide D5 gradually advances by the action ot' the camrDg, which forces the milling-tool D11 onto the end of the rod, reducing it to the size required for the body ot' the screw. This work accomplished, the slide quickly returns, as before described, and then it is necessary to give a transverse movement to the slide D5 in order to present the screw-cutting die D12. This transverse movement is imparted to the slide by means of a pinion, D14, arranged in the carriage D7 to work in a rack. D15, on the transverse slide D5. rlhe shaft D1G of the pinion D11 extends down through the carriage to the cam D9, and is there provided with a radially-projecting arm, d6. 0n the cam D1 is a radiallyprojecting stud, d1, which, so soon as the slide has-been returned, comes in contact with the arm d5 of the shalt, (see Fig. 12,) and, as the cam revolves, turns the shaft D16 until the stud d1 can pass the arm d5, which imparts to thepiniou D14 the requisite rotation to give to the slide D5 the required transverse movement to present the next tool or screw-cutting die D12. \Vhile the screw-cutting die is operating the straight part of the rib D10 is passing the stud d on the longitudinal slide, and hence imparts no longitudinal movement to the slide to advance the screw-cutting die.

It is difficult, not to sayv impossible, to construct and arrange a cam which shall give the required lead to screw-cutting dies, so as to follow the thread required to be cut. To provide a leading-screw to carry the screw-cutting die through its cutting operation necessitates a complication of mechanism, which it is desirable to avoid in machines ot' this class. To this end we have arranged a mechanism which will advance the screw-cutting die until it fully engages the blank, and the power which advanced it is then removed, and the die is left to work its way onto the body ot' the screw simply by the draft of the thread which is being cut.

The screw-cutting die D12 is arranged on the end of a hollow spindle, E3, which extends through the transverse slide or tool-holder D5, as seen in section, Fig. 14C. The spindle is prevented from rotation by means of a spline or stud working in a longitudinal groove, e, in the spindle-bearing, leaving it free for longitudinal movement. On the rear end of the spindle E5 is a head, E4, and between which lOO IIS

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and the back of the slide D5 is a spiral or other suitable spring, the tendency of whichis to hold the screwcutting die against the face ot" the tool-holder D5; but said spring yields soV as to permit the die to be moved forward from the face of the said tool-holder. The screwcutting die has now been presented into line. with the blank bythe transverse movement of the tool-holder, as before described, and at the same time into line with a spindle, E5, which is arranged in bearings E6 on the carriage D7 free for longitudinal movement. From the spindle E5 an arm, E7, extends down through the'slide into the path of an inclined rib, E8, on the cam D9, which, as the cam revolves, strikes in rear or outside of the arm ET and forces it forward, carrying with it the spindle E5 against the end of the spindle E5, which im parts to the spind lc ER a correspond l n g lon gitudinal movement, carrying the screw-cutting die onto the revolving blank, causing the die to out the thread a short distance on the blank, sufficient to makeatirm engagement therewith. So soon as the die has thus engaged the revolving blank the rib E, which advances the die, passes away from the arm E7, relieving that arm from theforward pressure, and then aspring,E9, or other suitable mechanism withdraws or returns the spindle E5, leaving the screw-cutting die free from pressure or other' movement than that which it acquires. by the thread which it is cutting upon the blank. As the screw-cutting die is brought into its position in line with the blank to be threaded it is also brought iu to connection with a bar, F, arranged in guides F', so as to be free for longitudinal movement and parallel with the mandrel. This engagement is made by a stud, F2, on the die, passing into a fork, F3, on the bar F, (see Fig. 2,) and so that after suoli engagemt-nt the bar will be moved longitudinally with the die. The object of moving the bar is to shift the clutch C4 for reversing the revolution of the mandrel to nnscrew the threaded blank from the die, it being understood that while the work is being performed upon the blank the clutch is engaged with the collar D on the mandrel,

as seen in Fig. 7, and is there held by the clutch-arm H, attached to a clutch-bar, H', arranged in suitable bearings for longitudinal movement only. A spring-pressure is applied to operate upon the clutch-bar H to throw it in either direction, so that the clutch may engage with either of the collars D `or E, as the case may be. The clutch is held in engage ment with the collar D by means of a bellcrank lever-latch, H2, hung upon a stationary bar, H3, in front of the clutch-bar H, as seen iu Fig. 7, the shoulder ot' the latch engaging with a projection or shoulder, h, on the clutchbar. As the cutting of the thread is being completed the bar F, moved by the advancing die, brings the arm H4, projecting from the said bar F, against the other arm ot' thelatch H2, which raises the latch from its engagement with the shoulder h, and permits the spring,

applied as hereinafter described, to'forc'e the clutch-bar H backward, and so as to carry with it the clutch C4 from its engagement with thecollarD into engagement with the reverse collar E, thus reversing the direction of revolution ofthe blank, and causing the die to withdraw therefrom. When the clutch-bar has been thrown, as described, to engage the clutch with the sleeve E it is caught by a bell-crank lever-latch, H5, which engages a shoulder, h', on the clutch-bar. The `latch H5 is hung upon the same bar, H5, as the first latch. rlhe spring which forces the clutch-bar H is applied first to throw the clutch in one direction and then at .the proper time in the opposite-direction. The construction wherehythe spring is so applied is shown in Fig. S. The bar H is made tubular, closed at both ends, and centrally within the bar is a follower, I, arranged to be moved longitudinally therein. A spring, I', is arranged between the closed end ofthe bar and that end ofthe follower, and at the opposite end is a similar spring, 12, the one 4suhstantially counterbalancing the other. From the follower I a stud, l5, extends downward, and stands in a notch or between studs ii on the sliding bar l, (see Fig. 7,) the bar I4 being arranged for longitudinal movement in bearings l5. To the har 14a longitudinal or haekand-forth movement is imparted by means of the cam U5 on the cam-shaft, which works in a notch in the end ot' an arm, l, extending down from the bar 14. (See Fig. 2.) The cam G7 is shaped, as seen iu Fig. 11, between the points t" 2 to movethe bar 14 in both directions within a short space. The position seen in Fig. 2 is that in which thecam G5 has reached the position which carries the bar l4 to its most forward position and just after the clutch has been thrown into connectien with the slee-ve D. As the cam G5 continues its movement it will force the bar l* to the rear, as seen in Fig. 7, correspondingly moving the follower lin the clutch-bar H, and compress the spring l2, as seen in Fig. S, preparatory for the movement of the clutch-bar, which is to change the clutch from its engagement with thel sleeve D to thc sleeve E, as before described. The clutch-bar is held by the latch H2 while this compression takes place, as seen in Fig. 7.

As soon as the latch HZ is disengaged, as before described, the springl2 is free to react, and forces the clutch-har rearward and the clutch C4 from its engagement with the collar D into engagement with the collar E, and the shoulder It on the clutch-har into engagement with the latch H5 to hold it in that position and until the next action ot' the cam O7 moves thebar Il forward, when a stud, 3, on the bar I4 will strike the lower arm of the latch H5 and trip it, so as to permit the clutch to be returned into connection with the sleeve D, the forward movement of the bar l4 having compressed the spring l in the clutch-bar before the tripping takes place, so that the said spring l is in condition to force this movement oi" the clutch- IOO Ill)

har and clutch. The latches are each provided with a spring to force them into engagement with their respective shoulders. So soon as the screw-cutting die has made suitable engagement with the screw, as before described, the cam-shaft B3 is disconnected from the driving-shaft, so that while the threading is being performed the cam-shaft remains stationary. The mechanism for making the disconnection is illustrated in Figs. 15, 16, and 17.

0n the cam shaft B3 is a gear-wheel,L,loose on the shaft, and which engages with the pinion L on the driving-shaft B by a train of gearing, as seen in Fig. 3, so that the wheel L has a constant revolution speeded by the intermediate gearing, so as to give the proper relative rotation to the shaft B3. Fast upon .the shaft B3, and running close to the wheel L, is a disk, L2, in which is an annular groove, L3. In-the disk L2 is a bolt, L4, arranged in the disk parallel with its axis, (see Figs. 15 and 17,) and provided with a spring, L5, the tendency of which is to force the bolt toward the wheel L. In the side of the wheel L, and next the disk L2, is a recess, Z, the saine radial distance from the center of the shaft as the bolt, so that when the bolt and the recess lcoincide, as in Fig. 15, the bolt may spring into the recess Z and engage the wheel L with the disk and its cam-shaft B3, so that the camshaft B3 will revolve in its regular relation to the driving-shaft so long as the bolt is in such engagement with thc wheel L. At the time when the threading-die has fully commenced its work the bolt L4 is withdrawn from the wheel. This withdrawal isproduced by means of a lever, L11, the lower end of this lever being constructed, as seen in Figs. 16 and 17, with a cam-piece, L1, to stand in the groove L3 in the disk. The bolt lies partly in the groove L3 of the disk, and in it is a notch, L3, which, as the disk revolves, engages upon the inclined surface ofthe cam-piece L7, and, the revolution of the disk continuing, that cam-piece Causes 'the bolt L4 to move away from its engagement with the wheel L, as seen in Fig. 17. So soon as theV withdrawal ofthe bolt L4 is completed the disk L2, with the cam-shaft B3, stops, the wheel L moving the notch laway from the bolt. As re-engageinent ofthe wheel L cannot be made so long as the bolt is thus held by the lever L3, the said lever is held out of active position, as indicated in broken lines, Fig. 17, until about the time the disconnection is required, and is then brought into play Ioy means of a cap, L9, on the disk, which partially overlaps the groove L3, as seen in Figs. 15 and 17. On the side of the lever is a shoulder, L13, with which the cap L3 engages as the disk revolves. This engagement occurs just before the disconnection is required, and the engagement draws the lower end of the lever toward the disk and the campiece L7 into the groove in the path of the notch in thebolt to operate, as before described.

The upper end, L11, of the lever L3 turns inward toward the sliding bar F, and rests against it when the lower end is free or out of the groovein the disk, being held there by a spring, L12. On the sliding bar F, immediately forward of the end L11 ofthe lever L3, is a projection, L13. The lower end of the lever is drawn in, as before described, just as the screw-cutting die commences its work. Then the projection L13, moving with the bar F, passes behind the end L11'of the lever, and preventsthe return of the lever when freed from the cap L2, so that lthe cam-piece L7 is still held in the groove L3 of the disk. So soon as the lever is thus held the cap L9 is carried beyond the shoulder L13, so as to leave that end of the lever free, so far as the cap L9 is concerned. The lever will be thus held, locking the bolt in its withdrawn condition until the screw-cutting dies have retreated and returned the bar F, so that the end L11 ot the lever can escape from the projection L13, as seen in Fig. 1. Then the upper end, L11, springs back against the bar F, withdrawing the cam-piece L7 from the groove, as seen in broken lilies, Fig. 17, and leaving the holtfree to re-engage the wheel L whenever the corresponding recess, l, in the wheel comes into line therewith, which is n1 mediately after the screw-cutting dies have been withdrawn, or near that point. The screw is not completely formed on the end ofthe rod, and the final operation of cutting off is to be performed.

P is a cutter-lever, hung upon a fulcruin,P", in rear ofthe axial line ofthe machine. (See Figs. l, 2, 3.) Une arm of this lever extends forward toward the center, and is there provided with a cutter, P2. The other arm, P3, extends down and engages with a groovein a side cam, P4, on the cam-shaft B3, the groove being seen in broken lines, Fig. 3. This cam forces the arm P3 of the lever outward, and brings the cutter downward and inward onto the rod back ofthe head ofthe screw, and so as to out the completed screw from the rod.

In some cases a second cutter-lever is employed, hung upon the opposite side of the mandrel, for the purpose of facilitating the cutting-off operation; but one only is shown in the drawings. This cutter or cutters may also shape the upper surface of the head. The screw cut off falls from the machine, thejaws are then opened, and the rod advanced for the second screw, as before described. After the nal operation of the screw-cutting die the transverse slide D5 requires to be returned to its rst position, and this is accomplished by aradially-projecting stud, S, on the cam D3 striking an arm, S', on the shaft of the wheel D14, nearly opposite the arm d1, so as to reverse the direction of the movement of the wheel D14 and return the slide.

To prevent accidental movement of the toolholder alter it has been once set, or to insure its stopping at exactly the right position, a latch, T, is hung on the carriage D8 upon a pivot, t, with a tail-piece, T', extending therefrom down through the carriage toward the IOO IOS

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Iranged on the cam D9.

the latch T will enter the notch whiehis pre-- sented before it when the tool is in its proper relative position to. the rod, and secure the tool-holder in that position until the latch is removed. To Withdraw the latch at the proper time, an incline, T4, on the cam D9, arranged at the point where the removal of the latch is required, raises the tail of the latch and turns the latch from its engagement with the toolholder, but will escape therefrom in time for the latch to engage the. tool-holder at the next position.

The distance to which the screw-cutting die will advance depends upon the position ofthe arm H4 on the bar F. It' it be nearer the arm ofthe latch H2, the latch will be tripped sooner; hence a shorter screw. If fart-her oI', it will be tripped later;V hence a longer screw. For the purpose of adapting the machine to varying lengths of screw the said arm H4 should be made adjustable on the bar F.

In case more tools are required to perform the work on the screw-as, for instance, more than one mill to cut the body of the screw 0r shape the head, or both-the number of arms on the lower end of the shaft of the ,gear D44 may be increased, and corresponding studs ar- In that case the cam D9 will be provided with additional ribs,which will give the forward-and-back movement to thetool-holder. For this purpose the ribs on the caln may be made adjustable or interchangeable, and the gears changed to give the necessaryT rotation to the camshaft.

We claiml. The combination of a chuck or holder for the blank to be operated upon, with a toolholder arranged on a carriage and in guides on said carriage at right angles to the axis of the chuck, said carriage arranged on guides parallel to the axis ot' said chuck, and means, substantially such as described, to impart longitudinal movement to said carriage on its guides and transverse movement to said tool-holder on its guides, substantially as described.

2. In a screw-making machine substantially such as described, the combination ot' a longitudinally-sliding carriage, with a tool-holder carrying the several tools and arranged upon said carriage on transverse guides, and mechanism, substantially such as described, to impart to said carriage its longitudinal or forward-and-back movement, and tothe said toolholder a transverse movement to present the several tools for work upon'the'rod and return thesaid slidingcarriage afterthetools have performed their respective opera-tion, and a lockingdevice, substantially such as described,

to engage said tool-holder as each tool is pre- I sented for work upon the rod, substantially as described. Y

3. In a screw-cutting machine substantially such as described, the combination of the hollow mandrel C, carrying the jaws C3, the tails of the jaws extending outside the mandrel, with the inclined sleeve G5, movable longitudinally on the mandrel between the tails of the jaws, and alever hung to said sleeve, a cam operating upon one arm ot' the said lever to move said sleeve forward and back to close and open said jaws, and a fulcrurn upon which the other arm of the lever is hung, with 4a spring on said fulcrum, against which the said arm of the lever bears, so as to permit the lever to yield so soon as the power of said spring is overcome, substantially as described.

4. In ascrew-makingmachine substantially such as described, a longitudinally-sliding carriage, a tool-holder movable transversely upon said carriage to present the respective tools for operation upon the blank, a gear-wheel hung in said carriage,working in a rack on said toolholder, and a cam to impart a back-and-forth longitudinal movement to said carriage, and also, at the proper time, to impart rotation to the said gear-wheel and corresponding transverse movement to the tool-bolder, substan-v tially as described.

5. In ascrew-making machine substantially such asdescribed, the combination ofthe longitudinally-movable screw-cutting die, the bar F, movable longitudinally with said die, the clutch-bar H', arranged to side parallel with said bar F, the cluteh-arin l1, extending from said clutch-bar in to engagement with the clutch C4, and latch-levers, substantially as described.

6. The combination of the longitudinallymovable screw-cutting die with the bar F, lever L6, projection L13 on said bar, the disk L2, txed to the cam-shaft, the gear L, loose on said shaftand engaged with the driving-shaft, inclined rib LT on the lower end of the lever, bolt L4 in the disk, and cap Lfon the disk, operating to draw the rib Llinto the path ofthe notch in the bol t, substantially as described.

7. The e-ombination ot' the longitudinallymovable screw-cutting die, the bar F, movable longitudinally with said die, the clutch-bar H, provided with an arm extending therefrom to the clutch on the mandrel, a follower within said clutch-bar, provided with a spring at each end, a'cain to impart to said follower a longitudinal movement to compress the spring tirst at one end and then at the other, a latch toengage the said clutch-bar at its extreme movement, an arm-ou said bar F to trip the latch which engages the clutch with the mandrel to impart a forward rotation, and mechanism, substantially such as described, to engage the mandrel for reverse rotation, substantially as described. j

S. In a machine for automatically making screws from the rod, the combination of the hollow mandrel carrying a chuck to grasp the ICO` lIO

s aoeaa v rod as the rod is presented thereto through plane, the other arm extending forward and the said hollow-mandrel, a longitudinal earoarrying the cutter rigidly attached thereto.

riage, a tool-holder arranged in transverse and which, by the vibratory movement of the i guides thereon, and carrying a series of tools 1 lever is forced inward to out the screw formed 15 l 5 which are successively presented in axial line on theendof the rod by said tool, substantially i with the mandrel for operation upon the proas described.

jeetfing end ofthe rod, and a lever hung upon a HENRY REYNOLDS. pivot to Swingin a plane at right angles to the J. ENGLISH. axis ofthe mandrel, one arm of said lever en- Witnesses: t io gaged with a cam on the camshaft to impart J oHN E. EARLE,

a swinging movement to said lever in said LILLIAN D. ROGERS. 

